Diazonium compounds and photographic compositions



DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at therequest of the applicant or owner in accordance with the Notice of Dec.16. 196i), 860 0.G. 087. The abstracts of Defensive Publicationapplications are identified by distinctly numbered series and arearranged chronologically. The bending of each abstract indicates thenumber of pages 01. specification. including claims and sheets ofdrawings contained in the application as originally tiled. The files ofthese applications are available to the public for inspection andreproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to themerits of alleged invention. The Patent Ofllce lnukol no assertion an tothe novelty of the disclosed subject matter.

PUBLISHED JULY 28, 1070 s70 on 816 I r T876,007 DIAZONIUM COMPOUNDS ANDPHOTOGRAPHIC COMPOSITIONS Frederick J. RHl-Hlel', Kodak Park Works,Rochester, N.Y. 14650 Filed Jan. 28, 1970, Ser. No. 6,444 Int. Cl. G03c1/54 [1.5. Ci. 96-91 1 Sheet Drawing. 14 Pages Specification A lightsensitive composition comprising a dye, e.g: a pyrylium dye, and anaromatic diazonium salt can be coated on a support material to prepare aphotographic element. After an imagewise exposure, development can beaccomplished by washing the exposed element with a solvent, such aswater, to remove dye from the unexposed areas, lcaving a monochromeimage in the exposed areas.

July 28, 1970 F. .J. RALJNER T876,007'

DIAZONIUM COMPOUNDS AND PHOTOGRAPHIC COMPOSITIONS Filed Jan. 28, 1970FIG.

N- METHYL /V P/iQ/VTL N'(4- -D/AZOBENZYL/DE/VE) HYDRAZONE iA/fx Till 1%till llll llll mflmm 2,6 D/PHE/VYL4-(4'D/ 4ZOPHE/VYL} THl/JPYRYL/UMPERCHLOHATE FREDERICK 1/. RA U/VER INVENTOR.

A 7' TOR/VEY

